#include <iostream>
#include <ctime>
#include <cmath>
using namespace std;
int main()
{
const int N=80;
double C[N], p = 1.0;
int i, k = 0;
srand(time(0));
for(i = 0; i < N; i++)
{
C[i]= (double)(rand() % 50) / 10 ;
if ( C[i] >= 1 && C[i] <= 2 )
{
p *= C[i];
++k;
}
}
if ( k > 0 )
cout << pow( p, 1.0/k );
else
cout << k;
return 0;
}